Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1995-06-14
1997-11-25
Dinh, Tan
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
34082535, G11B 1722
Patent
active
056919646
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a music playback system. This music playback system comprises a number of music playback units, each having a number of pieces of music at its disposal that can be played back and furthermore a central computer having memory, with a remote data transmission lines connecting the music playback units and the central computer.
In the international patent application PCT/DE91/00560 and in German Offenlegungsschrift DE-A-40 21 707, corresponding to U.S. Pat. No. 5,341,350, an automatic music player system is disclosed having a central unit and a plurality of decentralized terminals which are connected to the central unit. A central music memory is connected to the terminals via remote transmission lines which are suitable for the transmission of audio information. The terminals themselves, i.e. the automatic music players, do not comprise a playback unit. Rather, the desired information , i.e., the selected pieces of music, is retrieved from the central music memory. Thus, relatively inexpensive reproduction terminals and a central music memory having a correspondingly larger capacity can be used. A central computer stores user data of the individual automatic music players and processes the data.
GB-A-2 193 420 describes an automatic music player having a coin unit, a display, an input keyboard and at least one loudspeaker. The automatic music player is connected to a central music memory and computer via a remote data transmission line.
From EP-A-0 140 593, a music transmission system is known which comprises a central music playback unit. A number of consumers are in contact with this central playback unit, with the pieces of music which are transmitted via dedicated cable lines or transmitters then being reproduced in terminals such as, for example, video devices, etc. Unused video channels, for example, are utilized for the information that is to be transmitted. By means of suitable demodulation, the respectively desired piece of music can be selected from several pieces of music that were transmitted and can be listened to.
In a television system according to U.S. Pat. No. 4,471,379, television signals with a number of inverted video images are transmitted in a coded manner and are decoded in the television receiver according to the user identification number that is respectively present so that each user can only receive the television program that was selected and booked by him.
According to a method proposed in WO 90/15497 for the transmission of information from a central unit having a central memory to different consumers or users, the respectively required information is retrieved from the central memory and transmitted to the respective user.
From GB-A-2 185 361, a terminal for private use is known having a coding device and a memory for incoming data, An operating unit as well as a television set and a hi-fi device are provided for the data inquiry and display.
In an information retrieval system for narrow-band and broad-band information described in DE-OS 32 07 022, the broad-band information retrieval center can be configured as an audiovisual information bank having a corresponding control system, from which information bank the broad-band information is retrieved. A digital telephone network or an ISDN network is used as remote data transmission line. If such an ISDN network is used, high transmission rates can be achieved. The data reduction methods used in this process (1 bit reduction method) allow the transmission of music with a high audio quality.
SUMMARY OF THE INVENTION
It is the object of the invention to create a music playback system which is not very complex and which has inexpensive units.
This object is solved in a music playback system which includes a plurality of music playback units; a central computer having a memory that is provided in at least one of the music playback units; at least one input unit for selecting pieces of music that are to be played back on a music playback unit; and remote data transmission lines c
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patent: 5341350 (1994-08-01), Frank et al.
patent: 5497502 (1996-03-01), Castille
M. Yoshida et al.: "7 kHz Stereo Communication System for ISDN". In: NTT Review, vol. 4, No. 5, Sep. 1992, Tokyo, Japan, pp. 67-73.
Frank Armin
Huber Anton
Niederlein Horst
Dinh Tan
NSM Aktiengesellschaft
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